Swinging device of chair base

ABSTRACT

The present invention is to provide a swinging device of a chair base, including a support frame, and a base frame which are combined with each other by connecting racks, screws, and fastening structures. The support frame includes two side racks, two support rods each secured between the two side racks by screws, and two crossbars mounted between the bottoms of the two side racks. The base frame includes two side racks, and four connecting rods each secured between the two side racks by screws. The fastening structure includes a screw bearing, a cap washer, and a sleeve, and is locked by screws and nuts.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a swinging device of a chair base, and more particularly to a swinging device of a chair base, wherein various kinds of furniture may swing forward and backward, so that the user feels more comfortable in use. In addition, the swinging device may fit with other kinds of chairs, thereby increasing the versatility thereof.

[0003] 2. Description of the Related Art

[0004] A conventional chair in accordance with the prior art has a fixed structure, and cannot be adjusted to fit statures of different users, thereby greatly limiting the versatility of the conventional chair.

SUMMARY OF THE INVENTION

[0005] The primary objective of the present invention is to provide a swinging device of a chair base, wherein various kinds of furniture may swing forward and backward, so that the user feels more comfortable in use. In addition, the swinging device may fit with other kinds of chairs, thereby increasing the versatility thereof.

[0006] In accordance with the present invention, there is provided a swinging device of a chair base, comprising: a support frame, and a base frame which are combined with each other by connecting racks, screws, and fastening structures; wherein,

[0007] the support frame includes two side racks each having an inner face having a top having a left side and a right side each defining a plurality of screw holes, two support rods each secured and locked between the two side racks by means of a plurality of screws being screwed into the screw holes, and two crossbars mounted between the bottoms of the two side racks, each of the two support rods is formed with two through holes;

[0008] the base frame includes two side racks each having an inner face having a top and a bottom each having a left side and a right side each defining a plurality of screw holes, and four connecting rods each secured and locked between the two side racks by means of a plurality of screws being screwed into the screw holes;

[0009] the connecting rack includes two side rods, and a connecting rod secured and locked between the two side rods by means of a plurality of screws;

[0010] the fastening structure includes a screw bearing, a cap washer, and a sleeve, and is locked by screws and nuts;

[0011] the improvement comprising:

[0012] the support frame has a bottom having a front end and a rear end each having a left side defining a recess and a right side defining a recess, and four screw holes around each recess; the screw bearing is received in the recess, with its threaded end directed upward; the cap washer is placed on the screw bearing, and the screws are then screwed into the screw holes; through holes defined in a bottom of the connecting rack are planted on the screw bearings buried in the front and rear ends of the support frame, and the screw bearings are locked by nuts; through holes defined in a top of the connecting rack are respectively buried with a screw bearing, and four screw holes are formed around each through hole; the cap washer is locked on the top of the connecting rack by screws, and the screw bearing is protruded outward from the cap washer; the protruding screw bearings of the connecting racks are planted into through holes formed in a top of the base frame, and are locked by nuts.

[0013] Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014]FIG. 1 is a partially exploded perspective view of a swinging device of a chair base in accordance with the present invention;

[0015]FIG. 2 is a partially exploded perspective view of a swinging device of a chair base in accordance with the present invention;

[0016]FIG. 3 is a partially exploded perspective view of a swinging device of a chair base in accordance with the present invention;

[0017]FIG. 4 is a partially perspective assembly view of a swinging device of a chair base in accordance with the present invention;

[0018]FIG. 5 is a partially perspective assembly view of a swinging device of a chair base in accordance with the present invention;

[0019]FIG. 6 is a partially perspective assembly view of a swinging device of a chair base in accordance with the present invention;

[0020]FIG. 7 is a partially exploded perspective view of a swinging device of a chair base in accordance with the present invention;

[0021]FIG. 8 is a partially perspective assembly view of a swinging device of a chair base in accordance with the present invention;

[0022]FIG. 9 is a complete exploded perspective view of a swinging device of a chair base in accordance with the present invention;

[0023]FIG. 10 is a partially side plan cross-sectional view of a swinging device of a chair base in accordance with the present invention;

[0024]FIG. 11 is a partially side plan view of a swinging device of a chair base in accordance with the present invention;

[0025]FIG. 12 is a complete side plan view of a swinging device of a chair base in accordance with the present invention;

[0026]FIG. 13 is a complete side plan view of a swinging device of a chair base in accordance with the present invention;

[0027]FIG. 14 is a perspective view of the part of a swinging device of a chair base in accordance with another embodiment of the present invention;

[0028]FIG. 15 is a perspective view of the part of a swinging device of a chair base in accordance with another embodiment of the present invention; and

[0029]FIG. 16 is a complete perspective assembly view of a swinging device of a chair base in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0030] Referring to FIGS. 1-16, a swinging device of a chair base in accordance with the present invention comprises a support frame 1, and a base frame 2 which are combined with each other by connecting racks 3, screws 5, and fastening structures 4.

[0031] The support frame 1 includes two side racks 11 and 12 each having an inner face having a top having a left side and a right side each defining a plurality of screw holes 19, two support rods 13 and 14 each secured and locked between the two side racks 11 and 12 by means of a plurality of screws screwed into the screw holes 19, and two crossbars 111 mounted between the bottoms of the two side racks 11 and 12. The top of the support rod 13 is formed with two through holes 15, and the top of the support rod 14 is formed with two through holes 16.

[0032] The base frame 2 includes two side racks 21 and 22 each having an inner face having a top and a bottom each having a left side and a right side each defining a plurality of screw holes 29, and four connecting rods 23, 24, 25 and 26 each secured and locked between the two side racks 21 and 22 by means of a plurality of screws 5 screwed into the screw holes 29.

[0033] The connecting rack 3 includes two side rods 31 and 32, and a connecting rod 37 secured and locked between the two side rods 31 and 32 by means of a plurality of screws 5.

[0034] The fastening structure 4 includes a screw bearing 41, a cap washer 44, and a sleeve 45, and is locked by screws 5 and nuts 43. The cap washer 44 defines a recess 442 having a circular shape or a polygonal shape.

[0035] The improvement of the present invention is described as follows.

[0036] The support frame 1 has a bottom having a front end and a rear end each having a left side defining a recess 17 and a right side defining a recess 18, and four screw holes 19 around each recess 17 and 18. The screw bearing 41 is received in the recess 17 and 18, with its threaded end directed upward. The cap washer 44 is placed on the screw bearing 41, and the screws 5 are then screwed into the screw holes 19. Then, the through holes 33 and 34 of the bottom of the connecting rack 3 are planted on the screw bearings 41 buried in the front and rear ends of the support frame 1, and the screw bearings 41 are locked by nuts 43. The through holes 35 and 36 of the top of the connecting rack 3 are respectively buried with a screw bearing 41, and four screw holes 38 are formed around each through hole 35 and 36. The cap washer 44 is locked on the top of the connecting rack 3 by screws 5, and the screw bearing 41 is protruded outward from the cap washer 44. The protruding screw bearings 41 of the two connecting racks 3 are planted into the through holes 27 and 28 formed in the top of the base frame 2, and are locked by nuts 43.

[0037] Accordingly, the present invention has the following advantages.

[0038] 1. The present invention may be available to any environment and location, without restriction of space.

[0039] 2. The present invention may be manufactured to have a larger size to mate with a smaller size, so that not only the user's upper half can rest entirely, but also his legs can be loosened completely.

[0040] 3. The through holes formed in the top of the support frame may be available for various kinds of chairs, so that the present invention may form various kinds of chairs, thereby achieving the versatility effect.

[0041] 4. The present invention is not assembled by soldering, thereby greatly enhancing the aesthetic quality of the present invention.

[0042] 5. The present invention is locked by screws, so that the screws are not easily detached during long-term swaying action, thereby enhancing rigidity of the present invention.

[0043] 6. The present invention can be assembled and dismantled quickly and conveniently by rotating the nuts.

[0044] 7. The present invention may be applied to various kinds of tools and furniture, thereby increasing the utility thereof.

[0045] Although the invention has been explained in relation to its preferred embodiment as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention. 

What is claimed is:
 1. A swinging device of a chair base, comprising: a support frame, and a base frame which are combined with each other by connecting racks, screws, and fastening structures; wherein, the support frame includes two side racks each having an inner face having a top having a left side and a right side each defining a plurality of screw holes, two support rods each secured and locked between the two side racks by means of a plurality of screws being screwed into the screw holes, and two crossbars mounted between the bottoms of the two side racks, each of the two support rods is formed with two through holes; the base frame includes two side racks each having an inner face having a top and a bottom each having a left side and a right side each defining a plurality of screw holes, and four connecting rods each secured and locked between the two side racks by means of a plurality of screws being screwed into the screw holes; the connecting rack includes two side rods, and a connecting rod secured and locked between the two side rods by means of a plurality of screws; the fastening structure includes a screw bearing, a cap washer, and a sleeve, and is locked by screws and nuts; the improvement comprising: the support frame has a bottom having a front end and a rear end each having a left side defining a recess and a right side defining a recess, and four screw holes around each recess; the screw bearing is received in the recess, with its threaded end directed upward; the cap washer is placed on the screw bearing, and the screws are then screwed into the screw holes; through holes defined in a bottom of the connecting rack are planted on the screw bearings buried in the front and rear ends of the support frame, and the screw bearings are locked by nuts; through holes defined in a top of the connecting rack are respectively buried with a screw bearing, and four screw holes are formed around each through hole; the cap washer is locked on the top of the connecting rack by screws, and the screw bearing is protruded outward from the cap washer; the protruding screw bearings of the connecting racks are planted into through holes formed in a top of the base frame, and are locked by nuts.
 2. The swinging device of a chair base in accordance with claim 1, wherein the through holes of the top of the support frame may fit various chairs.
 3. The swinging device of a chair base in accordance with claim 1, wherein the cap washer defines a recess having a circular shape or a polygonal shape. 